1 /* 2 * Copyright (c) 2013 The TCPDUMP project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that: (1) source code 6 * distributions retain the above copyright notice and this paragraph 7 * in its entirety, and (2) distributions including binary code include 8 * the above copyright notice and this paragraph in its entirety in 9 * the documentation or other materials provided with the distribution. 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 13 * FOR A PARTICULAR PURPOSE. 14 * 15 * Original code by Ola Martin Lykkja (ola.lykkja (at) q-free.com) 16 */ 17 18 #define NETDISSECT_REWORKED 19 #ifdef HAVE_CONFIG_H 20 #include "config.h" 21 #endif 22 23 #include <tcpdump-stdinc.h> 24 25 #include "interface.h" 26 #include "extract.h" 27 #include "addrtoname.h" 28 29 30 /* 31 ETSI TS 102 636-5-1 V1.1.1 (2011-02) 32 Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; 33 Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol 34 35 ETSI TS 102 636-4-1 V1.1.1 (2011-06) 36 Intelligent Transport Systems (ITS); Vehicular communications; GeoNetworking; 37 Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; 38 Sub-part 1: Media-Independent Functionality 39 */ 40 41 #define GEONET_ADDR_LEN 8 42 43 static const struct tok msg_type_values[] = { 44 { 0, "CAM" }, 45 { 1, "DENM" }, 46 { 101, "TPEGM" }, 47 { 102, "TSPDM" }, 48 { 103, "VPM" }, 49 { 104, "SRM" }, 50 { 105, "SLAM" }, 51 { 106, "ecoCAM" }, 52 { 107, "ITM" }, 53 { 150, "SA" }, 54 { 0, NULL } 55 }; 56 57 static void 58 print_btp_body(netdissect_options *ndo, 59 const u_char *bp) 60 { 61 int version; 62 int msg_type; 63 const char *msg_type_str; 64 65 /* Assuming ItsDpuHeader */ 66 version = bp[0]; 67 msg_type = bp[1]; 68 msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type); 69 70 ND_PRINT((ndo, "; ItsPduHeader v:%d t:%d-%s", version, msg_type, msg_type_str)); 71 } 72 73 static void 74 print_btp(netdissect_options *ndo, 75 const u_char *bp) 76 { 77 uint16_t dest = EXTRACT_16BITS(bp+0); 78 uint16_t src = EXTRACT_16BITS(bp+2); 79 ND_PRINT((ndo, "; BTP Dst:%u Src:%u", dest, src)); 80 } 81 82 static int 83 print_long_pos_vector(netdissect_options *ndo, 84 const u_char *bp) 85 { 86 uint32_t lat, lon; 87 88 ND_PRINT((ndo, "GN_ADDR:%s ", linkaddr_string (ndo, bp, 0, GEONET_ADDR_LEN))); 89 90 if (!ND_TTEST2(*(bp+12), 8)) 91 return (-1); 92 lat = EXTRACT_32BITS(bp+12); 93 ND_PRINT((ndo, "lat:%d ", lat)); 94 lon = EXTRACT_32BITS(bp+16); 95 ND_PRINT((ndo, "lon:%d", lon)); 96 return (0); 97 } 98 99 100 /* 101 * This is the top level routine of the printer. 'p' points 102 * to the geonet header of the packet. 103 */ 104 void 105 geonet_print(netdissect_options *ndo, const u_char *eth, const u_char *bp, u_int length) 106 { 107 int version; 108 int next_hdr; 109 int hdr_type; 110 int hdr_subtype; 111 uint16_t payload_length; 112 int hop_limit; 113 const char *next_hdr_txt = "Unknown"; 114 const char *hdr_type_txt = "Unknown"; 115 int hdr_size = -1; 116 117 ND_PRINT((ndo, "GeoNet src:%s; ", etheraddr_string(ndo, eth+6))); 118 119 /* Process Common Header */ 120 if (length < 36) 121 goto malformed; 122 123 ND_TCHECK2(*bp, 7); 124 version = bp[0] >> 4; 125 next_hdr = bp[0] & 0x0f; 126 hdr_type = bp[1] >> 4; 127 hdr_subtype = bp[1] & 0x0f; 128 payload_length = EXTRACT_16BITS(bp+4); 129 hop_limit = bp[7]; 130 131 switch (next_hdr) { 132 case 0: next_hdr_txt = "Any"; break; 133 case 1: next_hdr_txt = "BTP-A"; break; 134 case 2: next_hdr_txt = "BTP-B"; break; 135 case 3: next_hdr_txt = "IPv6"; break; 136 } 137 138 switch (hdr_type) { 139 case 0: hdr_type_txt = "Any"; break; 140 case 1: hdr_type_txt = "Beacon"; break; 141 case 2: hdr_type_txt = "GeoUnicast"; break; 142 case 3: switch (hdr_subtype) { 143 case 0: hdr_type_txt = "GeoAnycastCircle"; break; 144 case 1: hdr_type_txt = "GeoAnycastRect"; break; 145 case 2: hdr_type_txt = "GeoAnycastElipse"; break; 146 } 147 break; 148 case 4: switch (hdr_subtype) { 149 case 0: hdr_type_txt = "GeoBroadcastCircle"; break; 150 case 1: hdr_type_txt = "GeoBroadcastRect"; break; 151 case 2: hdr_type_txt = "GeoBroadcastElipse"; break; 152 } 153 break; 154 case 5: switch (hdr_subtype) { 155 case 0: hdr_type_txt = "TopoScopeBcast-SH"; break; 156 case 1: hdr_type_txt = "TopoScopeBcast-MH"; break; 157 } 158 break; 159 case 6: switch (hdr_subtype) { 160 case 0: hdr_type_txt = "LocService-Request"; break; 161 case 1: hdr_type_txt = "LocService-Reply"; break; 162 } 163 break; 164 } 165 166 ND_PRINT((ndo, "v:%d ", version)); 167 ND_PRINT((ndo, "NH:%d-%s ", next_hdr, next_hdr_txt)); 168 ND_PRINT((ndo, "HT:%d-%d-%s ", hdr_type, hdr_subtype, hdr_type_txt)); 169 ND_PRINT((ndo, "HopLim:%d ", hop_limit)); 170 ND_PRINT((ndo, "Payload:%d ", payload_length)); 171 if (print_long_pos_vector(ndo, bp + 8) == -1) 172 goto trunc; 173 174 /* Skip Common Header */ 175 length -= 36; 176 bp += 36; 177 178 /* Process Extended Headers */ 179 switch (hdr_type) { 180 case 0: /* Any */ 181 hdr_size = 0; 182 break; 183 case 1: /* Beacon */ 184 hdr_size = 0; 185 break; 186 case 2: /* GeoUnicast */ 187 break; 188 case 3: switch (hdr_subtype) { 189 case 0: /* GeoAnycastCircle */ 190 break; 191 case 1: /* GeoAnycastRect */ 192 break; 193 case 2: /* GeoAnycastElipse */ 194 break; 195 } 196 break; 197 case 4: switch (hdr_subtype) { 198 case 0: /* GeoBroadcastCircle */ 199 break; 200 case 1: /* GeoBroadcastRect */ 201 break; 202 case 2: /* GeoBroadcastElipse */ 203 break; 204 } 205 break; 206 case 5: switch (hdr_subtype) { 207 case 0: /* TopoScopeBcast-SH */ 208 hdr_size = 0; 209 break; 210 case 1: /* TopoScopeBcast-MH */ 211 hdr_size = 68 - 36; 212 break; 213 } 214 break; 215 case 6: switch (hdr_subtype) { 216 case 0: /* LocService-Request */ 217 break; 218 case 1: /* LocService-Reply */ 219 break; 220 } 221 break; 222 } 223 224 /* Skip Extended headers */ 225 if (hdr_size >= 0) { 226 if (length < (u_int)hdr_size) 227 goto malformed; 228 ND_TCHECK2(*bp, hdr_size); 229 length -= hdr_size; 230 bp += hdr_size; 231 switch (next_hdr) { 232 case 0: /* Any */ 233 break; 234 case 1: 235 case 2: /* BTP A/B */ 236 if (length < 4) 237 goto malformed; 238 ND_TCHECK2(*bp, 4); 239 print_btp(ndo, bp); 240 length -= 4; 241 bp += 4; 242 if (length >= 2) { 243 /* 244 * XXX - did print_btp_body() 245 * return if length < 2 246 * because this is optional, 247 * or was that just not 248 * reporting genuine errors? 249 */ 250 ND_TCHECK2(*bp, 2); 251 print_btp_body(ndo, bp); 252 } 253 break; 254 case 3: /* IPv6 */ 255 break; 256 } 257 } 258 259 /* Print user data part */ 260 if (ndo->ndo_vflag) 261 ND_DEFAULTPRINT(bp, length); 262 return; 263 264 malformed: 265 ND_PRINT((ndo, " Malformed (small) ")); 266 /* XXX - print the remaining data as hex? */ 267 return; 268 269 trunc: 270 ND_PRINT((ndo, "[|geonet]")); 271 } 272 273 274 /* 275 * Local Variables: 276 * c-style: whitesmith 277 * c-basic-offset: 8 278 * End: 279 */ 280
